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This wasn't only a fluke late last night; it still happened today after having restarted the computer.
Original post from last night, ie. early morning:
Tonight I'm hearing a low buzzy sound from my speakers when I scroll the wheel on my mouse. It only happens when something on the screen is scrolling, not when the mouse is over something that can't scroll. Weird! Only the computer knows the cursor's position, not the mouse or speakers. So the computer must be generating a signal that the speaker is picking up. The loudness of the buzz differs based on which application I scroll. Weird!
Further observations today:
The buzz happens even without the mouse, when I scroll a page with the keyboard arrows.
The buzz also happens if I play a video with the sound off, without scrolling anything.
It only happens when the external speakers are plugged into the laptop. I should have noted before that the sound is coming from the external speakers, not the built-in ones.
Unplugging the power cord from the laptop makes no difference.
Current theory: The display must be generating electrical noise when it updates large portions of the screen at once.
Further observation and solution:
The laptop's volume was set to very low, and the external speakers' volume was turned higher than usual.
I don't remember when or why I did that. After switching them back to normal with the laptop volume set mid-to-high and the speaker volume lower, the buzz isn't noticeable.
Thank goodness; it had gotten quite annoying!
Original post from last night, ie. early morning:
Tonight I'm hearing a low buzzy sound from my speakers when I scroll the wheel on my mouse. It only happens when something on the screen is scrolling, not when the mouse is over something that can't scroll. Weird! Only the computer knows the cursor's position, not the mouse or speakers. So the computer must be generating a signal that the speaker is picking up. The loudness of the buzz differs based on which application I scroll. Weird!
Further observations today:
The buzz happens even without the mouse, when I scroll a page with the keyboard arrows.
The buzz also happens if I play a video with the sound off, without scrolling anything.
It only happens when the external speakers are plugged into the laptop. I should have noted before that the sound is coming from the external speakers, not the built-in ones.
Unplugging the power cord from the laptop makes no difference.
Current theory: The display must be generating electrical noise when it updates large portions of the screen at once.
Further observation and solution:
The laptop's volume was set to very low, and the external speakers' volume was turned higher than usual.
I don't remember when or why I did that. After switching them back to normal with the laptop volume set mid-to-high and the speaker volume lower, the buzz isn't noticeable.
Thank goodness; it had gotten quite annoying!